What is the average of the first 643 natural numbers?

The average of the first 643 natural numbers

Here we will define and show you the formula and the math to calculate the average of the first 643 natural numbers.

The first 643 natural numbers are the whole numbers (integers) that start with 1 and end with 643. To make a list of the first 643 natural numbers, you simply count up to 643.

To get the average of those 643 numbers, you add them up and then divide the sum by 643. We created a formula that can calculate the average of any sequence of natural numbers starting with 1. Here is the formula to calculate the average (avg) of the first n natural numbers:

avg = ((n × (n + 1)) ÷ 2) ÷ n

When we enter n = 643 in our formula, we get the average of the first 643 natural numbers. Here is the math and the answer:

avg = ((n × (n + 1)) ÷ 2) ÷ n
avg = ((643 × (643 + 1)) ÷ 2) ÷ 643
avg = ((643 × 644) ÷ 2) ÷ 643
avg = (414092 ÷ 2) ÷ 643
avg = 207046 ÷ 643
average = 322

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